Popsugar Health & Fitness Workouts Standing Core Exercises Farewell, Crunches — Do These 11 Standing Exercises For Tighter, Stronger Abs 6 October 2018 by Tamara Pridgett View On One Page Photo 3 of 9 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 3 High Knees Hold your hands at waist level. Hop the right knee up toward your hands, then quickly switch legs and hop the left knee up. This counts as one rep. Previous Next Start Slideshow Trainer TipsCore ExercisesStrength TrainingWorkoutsAb Exercises